Somebody forgot to bring along the U-bolts to clamp the microphones to the pole.

有人忘记带来把麦克风夹在支杆上的U型螺栓。

《柯林斯英汉双解大词典》

Products included are bolts, screws, studs, U-bolts, preassembled screw and washer assemblies (sems), and products manufactured the same as sems except without washer.

产品包括：螺栓、螺钉、螺柱、U型螺栓、预装配的螺钉和垫片组件以及与预装配组件一样加工的无垫圈产品。

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Some in-site vibrating test and metal fracture analysis have been done to reveal that the crack of the U-shaped bolts is fatigue failure and some reference for designer is put forward.

结合桥梁—人行道系统的现场振动测试和螺栓试样断口分析结果，指出既有桥上发生的U型螺栓破断属于疲劳破坏，并提出了改进意见。

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